Ultrasound diagnostic adapter, ultrasound diagnostic apparatus, and ultrasound diagnostic method

An ultrasound diagnostic adapter to be interposed between an ultrasound probe and a subject and used when diagnosing the subject using the ultrasound probe, the ultrasound probe transmitting and receiving ultrasound waves, said ultrasound diagnostic adapter comprising:

• a pad which has (i) a main surface that is a surface on a side where the ultrasound probe is disposed, and (ii) a back surface that is a surface which is opposite to the main surface and is on a side where the subject is disposed;
• and
• a first reflective member which is disposed inside said pad and made from a material having an acoustic impedance different from an acoustic impedance of a material included in said pad,
• wherein said first reflective member is disposed such that at least one of (i) a distance between said first reflective member and the main surface and (ii) a width of said first reflective member as seen from the side of the main surface varies depending on a position in the main surface.